* Academically: This usually means an A or B (or their numerical equivalents), but could also include a high C in some situations. The definition might be stricter in competitive programs or for certain courses.
* In a work setting (e.g., quality control): It would refer to a product or component meeting specified standards of quality, often expressed numerically as a percentage or within a tolerance range.
* In general usage: It simply indicates a grade that is pleasing or satisfactory to someone.
Therefore, without more context, "desirable grade" is relative and needs further clarification.